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Author: search.filters.author.Prachayawarakorn, JutaratSubject: search.filters.subject.Pectin

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    Property Improvement of Biodegradable High-Methoxy Pectin Film by Different Contents of Dialdehyde Starch
    (2020-08-01)
    Prachayawarakorn, Jutarat
    ;
    Poomkaew, Sasikorn
    In order to improve high hydrophilicity and low mechanical properties of biodegradable high-methoxy pectin (HMP) film, dialdehyde starch (DS) were introduced. In this study, different HMP/DS blended films were prepared by varying DS contents. It was observed from Infrared spectra that lower peak intensity of C=O stretching was detected after the incorporation of DS into HPM film. Moreover, moisture uptake of various HMP/DS blended films was found to be significantly lower than those of HMP film with the addition of low DS content. The improvement of mechanical properties was observed in various HPM/DS blended films. In addition, color parameters, swelling power, morphological and biodegradable properties of various HMP/DS blended films were also investigated.
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    Effect of pectin particles and cotton fibers on properties of thermoplastic cassava starch composites
    (2016-03-01)
    Prachayawarakorn, Jutarat
    ;
    Pattanasin, Worawan
    Due to poor mechanical properties and high water uptake of thermoplastic starch (TPS), this research focused on property improvement of thermoplastic cassava starch (TPCS) using natural compatible polymers, i.e. pectin particles and cotton fibers. Different TPCS composites, reinforced by the pectin particles and/or the cotton fibers, were compounded and shaped using an internal mixer and a compression molding machine, respectively. It was found from infrared (IR) spectra that the peak position of O-H stretching of the TPCS polymer clearly shifted to lower wavenumber by the addition of the pectin particles and/or the cotton fibers. Moreover, the significant increase of stress at maximum load and Young’s modulus of the TPCS/pectin particle and the TPCS/cotton fiber composites was observed. The drop of water uptake was also found when the cotton fibers were incorporated into the TPCS matrix with/without pectin particles. In addition, X-Ray Diffraction, Scanning Electron Microscopy and Thermogravimetric Analysis were used to characterize different TPCS composites.
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    Effect of pectin contents on properties of biodegradable thermoplastic mung bean starch/low-density polyethylene blends using injection molding technique
    (2016-01-01)
    Prachayawarakorn, Jutarat
    ;
    Hommanee, Luxana
    Mechanical properties and water uptake of thermoplastic starch (TPS)/low-density polyethylene (LDPE) blend are still the main problems for applications of biodegradable polymers; therefore, properties of the TPS/LDPE blends were, then, modified using pectin, a natural gelling agent. In this study, biodegradable polymer blends; prepared from thermoplastic mung bean starch (TPMBS) and LDPE, were processed using an injection molding technique. Different contents of pectin, i.e. 0%, 2%, 4%, 6%, 8% and 10% were added into the TPMBS/ LDPE blend. It was found from Fourier Transform Infrared spectroscopy (FT-IR) spectra that O-H stretching peak shifted to lower wavenumber by the addition of pectin, even with the presence of LDPE. Better phase compatibility between the TPMBS and LDPE phases, observed from Scanning Electron Microscopy (SEM) technique, was also detected by the addition of pectin. In addition, tensile properties of the TPMBS/LDPE blends were also significantly improved by the modification of pectin. Melt flow index, water absorption, thermal degradation temperature and biodegradability of different TPMBS/LDPE blends modified by pectin were also investigated.